Hey,
I just recently bought a 1987 5.0 LX and I was told by the owner that the radio tended to make noises at times. Well I didn't really mind not being able to listen to my radio at first, but now would like to try and fix it so I can listen to it. There's an aftermarket deck that has a CD player, speakers in the doors, and amp. I'm pretty sure that it's alternator whine because from what I read if the whine sound that it has increases and decreases with rpms then that's what it would be. It makes this whine when the radio is on and when a CD is in only when the engine is on, when it is off it sounds fine. I tryed unplugging the RCAs and listening for any sound and I heard none so I would imagine that the amp is grounded fine. From what I have read and understanded I need a noise filter/noise suppression kit. Wanted to get some input on this before I go and doing anything that I don't need to do. Any help would be great. Thanks in advance.

ground loop. Clean the ground spot to bare metal.

Hey,
Are you talking about the amp ground spot? If so I will check that out. The amp ground goes through a plastic interior piece and then into metal, would that have any effect on how good the ground is?

the wires inside of the grounding strap/wire must be in direct contact with a bare metal surface that leads directly to the negative lead on the battery.

Ok, I will try to check that out soon and see what happens. Thanks for the input.

Problem fixed. It was the ground for the amp.